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Home My WebLink AboutType of ConstructionTYPES OF CONSTRUCTION inches (152 mm) nominal in depth for the upper half. Framed or glued -laminated arches for roof construction that spring from the top of walls or wall abutments, framed timber trusses and other roof framing, which do not sup- port floor loads, shall have members not less than 4 inches (102 mm) nominal in width and not less than 6 inches (152 mm) nominal in depth. Spaced members shall be permit- ted to be composed of two or more pieces not less than 3 inches (76 mm) nominal in thickness where blocked sol- idly throughout their intervening spaces or where spaces are tightly closed by a continuous wood cover plate of not less than 2 inches (51 mm) nominal in thickness secured to the underside of the members. Splice plates shall be not less than 3 inches (76 mm) nominal in thickness. Where protected by approved automatic sprinklers under the roof deck, framing members shall be not less than 3 inches (76 mm) nominal in width. 602.4.6 Floors. Floors shall be without concealed spaces. Wood floors shall be constructed in accordance with Sec- tion 602.4.6.1 or 602.4.6.2. 602.4.6.1 Sawn or glued -laminated plank floors. Sawn or glued -laminated plank floors shall be one of the following: 1. Sawn or glued -laminated planks, splined or tongue -and -groove, of not less than 3 inches (76 mm) nominal in thickness covered with 1-inch (25 mm) nominal dimension tongue -and -groove flooring, laid crosswise or diagonally, 15/32-inch (12 mm) wood structural panel or '/z inch (12.7 mm) particleboard. 2. Planks not less than 4 inches (102 mm) nominal in width set on edge close together and well spiked and covered with 1-inch (25 mm) nominal dimension flooring or 15/32 inch (12 mm) wood structural panel or '/Z inch (12.7 mm) particle- board. The lumber shall be laid so that no continuous line of joints will occur except at points of support. Floors shall not extend closer than inch (12.7 mm) to walls. Such '/Z inch (12.7 mm) space shall be covered by a molding fastened to the wall and so arranged that it will not obstruct the swelling or shrinkage movements of the floor. Corbelling of masonry walls under the floor shall be permitted to be used in place of molding. 602.4.6.2 Cross -laminated timber floors. Cross -lami- nated timber shall be not less than 4 inches (102 mm) in thickness. Cross -laminated timber shall be continuous from support to support and mechanically fastened to one another. Cross -laminated timber shall be permitted to be connected to walls without a shrinkage gap pro- viding swelling or shrinking is considered in the design. Corbelling of masonry walls under the floor shall be permitted to be used. 602.4.7 Roofs. Roofs shall be without concealed spaces and wood roof decks shall be sawn or glued laminated, splined or tongue -and -groove plank, not less than 2 inches (51 mm) nominal in thickness; 1'/,-inch-thick (32 mm) wood structural panel (exterior glue); planks not less than 3 inches (76 mm) nominal in width, set on edge close together and laid as required for floors; or of cross -lami- nated timber. Other types of decking shall be permitted to be used if providing equivalent fire resistance and struc- tural properties. Cross -laminated timber roofs shall be not less than 3 inches (76 mm) nominal in thickness and shall be continu- ous from support to support and mechanically fastened to one another. 602.4.8 Partitions and walls. Partitions and walls shall comply with Section 602.4.8.1 or 602.4.8.2. 602.4.8.1 Interior walls and partitions. Interior walls and partitions shall be of solid wood construction formed by not less than two layers of 1-inch (25 mm) matched boards or laminated construction 4 inches (102 mm) thick, or of 1-hour fire -resistance -rated con- struction. 602.4.8.2 Exterior walls. Exterior walls shall be of one of the following: 1. Noncombustible materials. 2. Not less than 6 inches (152 mm) in thickness and constructed of one of the following: 2.1. Fire -retardant -treated wood in accor- dance with Section 2303.2 and complying with Section 602.4.1. 2.2. Cross -laminated timber complying with Section 602.4.2. 602.4.9 Exterior structural members. Where a horizon- tal separation of 20 feet (6096 mm) or more is provided, wood columns and arches conforming to heavy timber sizes shall be permitted to be used externally. 602.5 Type V. Type V construction is that type of construc- tion in which the structural elements, exterior walls and inte- rior walls are of any materials permitted by this code. SECTION 603 COMBUSTIBLE MATERIAL IN TYPES I AND II CONSTRUCTION 603.1 Allowable materials. Combustible materials shall be permitted in buildings of Type I or II construction in the fol- lowing applications and in accordance with Sections 603.1.1 through 603.1.3: 1. Fire -retardant -treated wood shall be permitted in: 1.1. Nonbearing partitions where the required fire - resistance rating is 2 hours or less. 1.2. Nonbearing exterior walls where fire -resis- tance -rated construction is not required. 1.3. Roof construction, including girders, trusses, framing and decking. Exception: In buildings of Type IA con- struction exceeding two stories above grade plane, fire -retardant -treated wood is not permitted in roof construction where 2015 INTERNATIONAL BUILDING CODE® 115 lilhimio],IF.Iiral,lf,IWJ,lil4F;r,TrTTrM Copyright to, or licensed by, ICC (ALL RIGHTS RESERVED); accessed by John Plano on Jan 6, 2015 5:29:58 PM pursuant to License Agreement. TYPES OF CONSTRUCTION the vertical distance from the upper floor to the roof is less than 20 feet (6096 mm). 2. Thermal and acoustical insulation, other than foam plastics, having aflame spread index of not more than 25. Exceptions: 1. Insulation placed between two layers of noncombustible materials without an inter- vening airspace shall be allowed to have a flame spread index of not more than 100. 2. Insulation installed between a finished floor and solid decking without intervening airspace shall be allowed to have aflame spread index of not more than 200. 3. Foam plastics in accordance with Chapter 26. 4. Roof coverings that have an A, B or C classification. 5. Interior floor finish and floor covering materials installed in accordance with Section 804. 6. Millwork such as doors, door frames, window sashes and frames. 7. Interior wall and ceiling finishes installed in accor- dance with Sections 801 and 803. 8. Trim installed in accordance with Section 806. 9. Where not installed greater than 15 feet (4572 mm) above grade, show windows, nailing or furring strips and wooden bulkheads below show windows, includ- ing their frames, aprons and show cases. 10. Finish flooring installed in accordance with Section 805. 11. Partitions dividing portions of stores, offices or simi- lar places occupied by one tenant only and that do not establish a corridor serving an occupant load of 30 or more shall be permitted to be constructed of fire - retardant -treated wood, 1-hour fire -resistance -rated construction or of wood panels or similar light con- struction up to 6 feet (1829 mm) in height. 12. Stages and platforms constructed in accordance with Sections 410.3 and 410.4, respectively. 13. Combustible exterior wall coverings, balconies and similar projections and bay or oriel windows in accor- dance with Chapter 14. 14. Blocking such as for handrails, millwork, cabinets and window and door frames. 15. Light -transmitting plastics as permitted by Chapter 26. 16. Mastics and caulking materials applied to provide flexible seals between components of exterior wall construction. 17. Exterior plastic veneer installed in accordance with Section 2605.2. 18. Nailing or furring strips as permitted by Section 803.11. 19. Heavy timber as permitted by Note c to Table 601 and Sections 602.4.7 and 1406.3. 20. Aggregates, component materials and admixtures as permitted by Section 703.2.2. 21. Sprayed fire-resistant materials and intumescent and mastic fire-resistant coatings, determined on the basis of fire resistance tests in accordance with Section 703.2 and installed in accordance with Sections 1705.14 and 1705.15, respectively. 22. Materials used to protect penetrations in fire -resis- tance -rated assemblies in accordance with Section 714. 23. Materials used to protect joints in fire -resistance -rated assemblies in accordance with Section 715. 24. Materials allowed in the concealed spaces of build- ings of Types I and II construction in accordance with Section 718.5. 25. Materials exposed within plenums complying with Section 602 of the International Mechanical Code. 26. Wall construction of freezers and coolers of less than 1,000 square feet (92.9 ni), in size, lined on both sides with noncombustible materials and the building is protected throughout with an automatic sprinkler system in accordance with Section 903.3.1.1. 603.1.1 Ducts. The use of nonmetallic ducts shall be per- mitted where installed in accordance with the limitations of the International Mechanical Code. 603.1.2 Piping. The use of combustible piping materials shall be permitted where installed in accordance with the limitations of the International Mechanical Code and the International Plumbing Code. 603.1.3 Electrical. The use of electrical wiring methods with combustible insulation, tubing, raceways and related components shall be permitted where installed in accor- dance with the limitations of this code. 116 2015 INTERNATIONAL BUILDING CODE® KJ004MM= Copyright to, or licensed by, ICC (ALL RIGHTS RESERVED); accessed by John Plano on Jan 6, 2015 5:29:58 PM pursuant to License Agreement.